Novel anaerobic modifier and preparation method thereof

Abstract

The invention discloses a novel anaerobic modifier and a preparation method thereof. The novel anaerobic modifier is prepared from the following components in parts by weight: 35-45 parts of inositolhexaphosphate, 15-25 parts of polyhydroxycarboxylic acid, 8-12 parts of carboxyethyl thiosuccinic acid, 10-15 parts of a maleic acid-acrylic acid copolymer, 1-2 parts of dodecylbenzene sulfonic acid,1-2 parts of nickel nitrate and the balance of desalted water. The anaerobic modifier has advantages that a circulating pipe network and an outer overflow pipe of an anaerobic reactor are not blockedand not bonded to generate crystal substances; the purpose of long-term safe operation of the reactor is achieved; the characteristic that the existing landfill leachate generally contains animal andvegetable oil is completely matched; the problem of crystallization blockage of an anaerobic reactor pipe network can be solved; under normal addition metering (100ppm), the water quality crystallization rate is delayed by 90% or above, and if the addition metering is increased to 130pp or above for use, old crystals in the pipe network can be slowly eliminated, and an effect of cleaning the old black crystals in the pipe network is achieved, so that the pipe network is smooth step by step, and the anaerobic oxygen reactor is recovered to operate according to design parameters.

Description

technical field [0001] The invention belongs to the technical field of anaerobic modifiers, in particular to a novel anaerobic modifier and a preparation method thereof. Background technique [0002] During the anaerobic treatment of landfill leachate, due to large fluctuations in water quality, complex components, high SS, ammonia nitrogen, salinity, high COD, and low B / C value, some leachate also contains animal and vegetable oils, causing frequent occurrences in the system pipe network Problems such as crystallization, fouling, floating of activated sludge, and run-off of activated sludge run through the entire process of leachate treatment, resulting in the constant limitation of the influent load of the biochemical tank, the failure of optimal utilization of the treatment efficiency, and the high failure rate and rapid aging of equipment, etc. It is difficult to keep the system running stably and continuously for a long period of time. [0003] 1. The water quality cry...

AI Technical Summary

Problems solved by technology

[0002] During the anaerobic treatment of landfill leachate, due to large fluctuations in water quality, complex components, high SS, ammonia nitrogen, salinity, high COD, and low B / C value, some leachate also contains animal and vegetable oils, causing frequent occurrences in the system pipe network Problems such as crystallization, fouling, floating of activated sludge, and run-off of activated sludge run through the entire process of leachate treatment, resulting in the constant limitation of the influent load of the biochemical tank, the failure of optimal utilization of the treatment efficiency, and the high failure rate and rapid aging of equipment, etc. problems, it is difficult to keep the system running stably and continuously for a long period of time

[0003] 1. The water quality crystallizes and forms black crystals to block

[0004] Black crystals are rapidly formed in various parts of the anaerobic reactor, such as external water inlet and outlet pipes, circulation main pipes, distribution pipes, circulation pump impellers, valves, etc., internal sludge outlets, three-phase separators, overflow weirs, pool bottoms, The pool wall and other crystals are blocked or even hardened, which seriously affects the normal and stable operation of the production load; the UASB system is frequently repaired and the pipe network is replaced. Every 2-3 years, the production must be stopped for major repairs to clean the pool and restart processing, and major repairs and maintenance will occur costs, while facing various safety and environmental pressures

[0005] 2. Ammonia nitrogen and total nitrogen in the effluent of the nitrification tank exceed the standard

[0006] Due to the crystallization and blockage of the outlet of the water distribution pipe inside the anaerobic reactor, the leachate cannot fully contact and react with the bacteria in the sludge bed, and the gas production and hydraulic agitation are poor, so that the real and effective utilization rate of the UASB pool is low (there is a partial lack of water area), the activated sludge is difficult to granulate, the COD removal rate is reduced and the influent load is limited; at the same time, the hydrolysis conversion and decomposition rate of refractory insoluble organic matter also plummets, resulting in more undegraded macromolecular substances in the anaerobic effluent. In turn, the small molecule carbon source required for the biochemistry of the denitrifying bacteria is insufficient, and the sludge activity properties deteriorate, so the denitrification efficiency begins to decrease, and the total nitrogen in the effluent is high.

[0007] Due to many reasons, such as low conversion rate of nitrate nitrogen, enrichment of nitrate nitrogen in O pond, poor sludge activity, crystallization blockage at the end of aeration, mechanical damage and high MLSS, the conversion reaction of nitrifying bacteria to ammonia nitrogen is inhibited , the conversion rate of ammonia nitrogen is reduced, sapropel is produced and enters the UF system with undegraded macromolecules, resulting in an increase in ammonia nitrogen in the effluent of the denitrification tank, frequent cleaning of UF filter screens and UF membranes, and artificial membrane passage. Nitrification effluent is limited, liquid level rises, etc.

[0008] 3. Due to crystallization problems, the equipment integrity rate becomes low, and the reliability of online instrument readings is poor, which affects the operation and control

[0009] On-line monitoring instruments are fragile (due to fouling and crystallization of the probe, etc.), and the accuracy and reliability of monitoring data become poor; inlet pumps, circulation pumps, return pumps, jet pumps, blowers, aerator heads, diaphragms, booster circulation pumps, etc. Major equipment, instruments, and key valves are forced to operate at overload due to crystallization blockage, which is more prone to failure, affecting the normal operation of biochemical treatment, and energy consumption is also high

[0010] At present, someone has prepared an additive called interferon for sewage, which is continuously added to the water inlet pipeline of the anaerobic reactor in metered quantities. Under this condition, it can better solve the problem of 80% blockage of the above-mentioned pipe network crystallization, but there are the following defects:

[0012] 2. The interferon additive used in the sewage cannot remove the black crystal scale (magnesium ammonium phosphate hexahydrate, calcium carbonate, magnesium carbonate, etc.) that has formed in the anaerobic pipe network, but can only slow down the crystallization by about 80%.